文部科学省グローバルCOEプログラム 関西大学文化交渉学教育研究拠点 松浦章教授古稀記念号 [東アジアの言語と表象] After the Meiji era, there was significant changes occurred in Japanese vocabulary, and the modernization has progressed gradually. One of the facts that demonstrated the modernization of the vocabulary was the rapid increase of the kanji na-adjective, which greatly influenced the adjective system. Focused on the word "seikaku (正確)", this article studied on the formation and establishment of "seikaku (正確)" synonym group, and the acceptance of "seikaku (正確)" after it was lately introduced into Chinese. As a result, we found that from the end of the 19th century to the beginning of the 20th century, the meaning of "seikaku (正確)" was established, the distinction between "seikaku (正確)" and "tadashi- (正しい)" "seimitsu (精密)" became clear, and the modernization of the "seikaku (正確)" synonym group was completed. Furthermore, theword "seikaku (正確)" entered the Chinese language in the early 20th century, and was widely used.